Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and equipment for producing nitric acid in optional intermediate density

A technology of concentrated nitric acid and high concentration, which is applied in the direction of nitric acid, nitrogen oxides/oxygen acid, etc., can solve the problems of large space occupation, small production batch, pollution, etc., achieve continuous and intermittent production, product quality assurance, and investment funds little effect

Active Publication Date: 2006-10-18
TIANJI COAL CHEM IND GROUP
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The transition concentration nitric acid currently used in the market is made by diluting high concentration nitric acid with water. The disadvantage is that the production is manual, the quality of the product cannot be effectively controlled, the production batch is small, and it takes up a lot of space, especially when diluting The nitrogen oxides released during the nitric acid process cannot be recovered, and after being discharged directly, serious pollution is caused

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and equipment for producing nitric acid in optional intermediate density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Such as figure 1 As shown, the dilute nitric acid produced by the absorption tower 1 flows into the bleaching tower 3 through a connecting channel 8, and a flow meter 5 is installed on the connecting channel 8, and the flow rate F1 of the dilute nitric acid is monitored by a flow ratio control unit 11. Use a concentrated nitric acid pump 4 to also pump the concentrated nitric acid in the storage tank 2 into the bleaching tower 3 through the connecting channel 9. A flow meter 6 and a regulating valve 7 are installed on the connecting channel 9, and the flow ratio control unit 11 is based on the detected flow rate. Meter 5 flow F1 and the concentration of concentrated and dilute nitric acid, control the regulating valve 7 to adjust the flow F2 of flow meter 6, and keep the flow ratio F2 / F1 constant to produce nitric acid with any transitional concentration.

[0026] Concentrated nitric acid and dilute nitric acid enter the tower from the upper part of the bleaching tower ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method and device for producing transition concentration nitric acid by utilizing high concentration and low concentration nitric acid. On the existing dilute nitric acid production device, the concentrated nitric acid and the dilute nitric acid are mixed by a flow rate ratio control unit with an accurate ratio ratio, and bleaching is added together. The nitrogen oxides released are brought back to the absorption tower for recycling through the secondary air. By changing the flow ratio setting of dilute nitric acid and concentrated nitric acid, the production of nitric acid with any concentration can be realized.

Description

Technical field [0001] The invention relates to a production method of nitric acid, in particular to a method for producing transition concentration nitric acid by using high-concentration and low-concentration nitric acid, and a device for realizing the method. Background technique [0002] Generally, nitric acid with a concentration of ≤68% is called dilute nitric acid, and nitric acid with a concentration of ≥98% is called concentrated nitric acid. Correspondingly, there are also production methods and devices for dilute nitric acid and concentrated nitric acid. [0003] The highest concentration of nitric acid produced by the traditional dilute nitric acid production method is about 60-67%. The production of dilute nitric acid can be improved by increasing the absorption pressure, increasing the absorption specific volume, lowering the absorption temperature with refrigerated liquid, and adding a reboiler. Concentration, but it is more difficult to exceed 68%, and the en...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/38
Inventor 王全文
Owner TIANJI COAL CHEM IND GROUP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com